From the BRLTTY mailing list:
BRLTTY-6.8 has been released. As usual, it can be downloaded from:
http://brltty.app/
First, a note to Linux distribution maintainers. We'd very much appreciate it if
you could please update BRLTTY to this release - 6.8 - before upgrading to the
6.16 kernel. This is because of a much needed change within the kernel regarding
how double-width and zero-width characters are rendered on the screen when using
a text console. It couldn't be done in a fully backward-compatible way from
BRLTTY's perspective so, if the 6.16 kernel is being used before BRLTTY is at
least at 6.8, a braille user may notice some unexpected characters - primarily
zero-width spaces - when viewing a screen with double-width and/or zero-width
characters on it.
BRLTTY is (finally) able to properly render a screen that's larger than 255
columns and/or lines. There's one limitation when using a kernel earlier than
6.16 - the location of the cursor can't be determined if it's beyond column
and/or line 255 of the screen, In which case it isn't rendered.